Configuration & Settings
Master .NET Core's configuration system and settings management. This is a foundational concept in cross-platform .NET development that professional developers rely on daily. The explanations below are written to be beginner-friendly while covering the depth and nuance that comes from real-world .NET Core experience. Take your time with each section and practice the examples
Configuration Sources
`.NET Core supports multiple configuration sources that are loaded in a specific order, with later sources overriding earlier ones.. This is an essential concept that every .NET Core developer must understand thoroughly. In professional development environments, getting this right can mean the difference between code that works reliably and code that breaks in production. The following sections break this down into clear, digestible pieces with practical examples you can try immediately
Configuration Providers
// JSON files
config.AddJsonFile("appsettings.json");
config.AddJsonFile("appsettings.Development.json", optional: true);
// Environment variables
config.AddEnvironmentVariables();
// Command line arguments
config.AddCommandLine(args);
// User secrets (development only)
config.AddUserSecrets<Program>();
// Azure Key Vault
config.AddAzureKeyVault(vaultUrl, clientId, clientSecret);
// Custom provider
config.Add(new CustomConfigurationProvider());Strongly-Typed Configuration
// Define configuration class
public class DatabaseOptions
{
public const string SectionName = "Database";
public string ConnectionString { get; set; }
public int CommandTimeout { get; set; } = 30;
public bool EnableRetryOnFailure { get; set; } = true;
}
// Register in DI container
services.Configure<DatabaseOptions>(
configuration.GetSection(DatabaseOptions.SectionName));
// Use in your service
public class DataService
{
private readonly DatabaseOptions _options;
public DataService(IOptions<DatabaseOptions> options)
{
_options = options.Value;
}
public void Connect()
{
// Use _options.ConnectionString
}
}